Improvement in indicators for telephone alarm-bells



O. JONES. Indicator for Telephone Alarm Bells.

No. 203,738. Patented May 14, 187

N. PEYERB, PNDTUvUTHUGRAFHER,'WASHING1DN. D C

UNITED STATES PATENT OEEIoE.

CHARLES W. JONES, OF VIN OENNES, INDIANA.

IMPROVEMENT IN INDICATORS FOR TELEPHONE ALARM-BELLS.

Specification forming part of Letters Patent No. 203,738, dated May 14,1878; application filed April 8, 1878.

other instrument which has an alarm-bell attached to it, as will behereinafter set forth.

In order to enable others skilled in the art to which my inventionappertains to make and usethe same, I will now proceed to de' more fullyscribe its construction and operation, referring to the annexed drawing,in which- Figure 1 shows my invention attached to a telephone inposition set to receive alarm. Fig. 2 is a perspective view of theindicator alone.

A representsa plate, of suitable dimensions, to be attached to thetelephone below the alarm-bell. Upon a stud, a, on this plate is pivoteda lever, B, the outer end of which forms the indicating-hand, and isprovided with a handle, B. The inner end of the lever B has an arm, b,extending upward from it at right angles, and the end thereof is madepointed, as shown.

Above the lever B, on a stud, a, is pivoted an L-shaped lever, O, theupper arm of which terminates in a wire hook, d. The other arm of thelever has a notch at a: to fit over the pointed end of the arm b, asshown in the drawing, when the indicator is set in position ready toreceive the alarm.

A wire, 6, is attached to the arm b, passing over the lower arm of thelever O. h h are pins to limit the movement of the lever B, and t is apin forthe same purpose for the lever C.

When the alarm is sounded the lever O turns on its pivot, and theindicating-lever B drops down, showing at a glance that the alarm hasbeen rung. p y

The alarm-indicator is operated by the vibration of the hammer of thecall-bell in striking the alarm.

The hammer or arm of the hammer, against which the upright arm O of theindicator is placed, strikes the upper arm of the indicator, which ispushed back, and the lower part of this arm 0 is consequently raised,and. thereby releases the lowerlever B from the notch w in the arm 0,and the lower lever thereby drops downward, and thus, by its position,shows that the alarm-hammer has having been rung by the operator at theother end of the line or some intermediate station of the line.

The use of the indicator is to show the operator whether or not thealarm has been rung during his absence from the room containingtheinstrument. It may be applied to any instrument which has an alarm-bellattached, or to any alarm bell or spring used for the purpose of analarm, or to a telegraphic switchkey, or, in fact, to any instrumentwhich is used as a means of communication between different points.

Having thus fully described my invention, What I claim as new, anddesire to secure by Letters Patent, is-

The i ndicating-lever B, with its pointed arm I), and the lever 0,having a notch, 05, in its lower arm, and combined with the alarm of atelephone or other instrument, so that the vibration of the hammer-leverwill operate the indicator, for the purposes herein set forth,

In testimony that I claim the foregoing I have hereunto set my hand this23d day of March, 1878.

CHARLES W. JONES. vWitnesses:

CHARLES. HEIDENREIG'H, JAGOB METZGER, JACOB MANDERY.

been vibrated by

